1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 static char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93"; 36 #endif /* not lint */ 37 38 /* 39 * This file contains the I/O handling and the exchange of 40 * edit characters. This connection itself is established in 41 * ctl.c 42 */ 43 44 #include <sys/ioctl.h> 45 #include <sys/time.h> 46 #include <stdio.h> 47 #include <errno.h> 48 #include <string.h> 49 #include "talk.h" 50 51 #define A_LONG_TIME 10000000 52 #define STDIN_MASK (1<<fileno(stdin)) /* the bit mask for standard 53 input */ 54 55 /* 56 * The routine to do the actual talking 57 */ 58 talk() 59 { 60 register int read_template, sockt_mask; 61 int read_set, nb; 62 char buf[BUFSIZ]; 63 struct timeval wait; 64 65 message("Connection established\007\007\007"); 66 current_line = 0; 67 sockt_mask = (1<<sockt); 68 69 /* 70 * Wait on both the other process (sockt_mask) and 71 * standard input ( STDIN_MASK ) 72 */ 73 read_template = sockt_mask | STDIN_MASK; 74 for (;;) { 75 read_set = read_template; 76 wait.tv_sec = A_LONG_TIME; 77 wait.tv_usec = 0; 78 nb = select(32, &read_set, 0, 0, &wait); 79 if (nb <= 0) { 80 if (errno == EINTR) { 81 read_set = read_template; 82 continue; 83 } 84 /* panic, we don't know what happened */ 85 p_error("Unexpected error from select"); 86 quit(); 87 } 88 if (read_set & sockt_mask) { 89 /* There is data on sockt */ 90 nb = read(sockt, buf, sizeof buf); 91 if (nb <= 0) { 92 message("Connection closed. Exiting"); 93 quit(); 94 } 95 display(&his_win, buf, nb); 96 } 97 if (read_set & STDIN_MASK) { 98 /* 99 * We can't make the tty non_blocking, because 100 * curses's output routines would screw up 101 */ 102 ioctl(0, FIONREAD, (struct sgttyb *) &nb); 103 nb = read(0, buf, nb); 104 display(&my_win, buf, nb); 105 /* might lose data here because sockt is non-blocking */ 106 write(sockt, buf, nb); 107 } 108 } 109 } 110 111 extern int errno; 112 extern int sys_nerr; 113 114 /* 115 * p_error prints the system error message on the standard location 116 * on the screen and then exits. (i.e. a curses version of perror) 117 */ 118 p_error(string) 119 char *string; 120 { 121 wmove(my_win.x_win, current_line%my_win.x_nlines, 0); 122 wprintw(my_win.x_win, "[%s : %s (%d)]\n", 123 string, strerror(errno), errno); 124 wrefresh(my_win.x_win); 125 move(LINES-1, 0); 126 refresh(); 127 quit(); 128 } 129 130 /* 131 * Display string in the standard location 132 */ 133 message(string) 134 char *string; 135 { 136 wmove(my_win.x_win, current_line % my_win.x_nlines, 0); 137 wprintw(my_win.x_win, "[%s]", string); 138 wclrtoeol(my_win.x_win); 139 current_line++; 140 wmove(my_win.x_win, current_line % my_win.x_nlines, 0); 141 wrefresh(my_win.x_win); 142 } 143